baber/WOPTO huggingface dataset:
Patent KR-20000015203-A (KR)
Title: Food waste processing device
Inventor: KIM JONG SUK
IPC: B09B3/00
Filed: 1998-08-27
Abstract: PURPOSE: A food waste processing device is provided not to ventilate the smell gas inside a fermenting tub into the indoor through an inlet by operating an inhale force according to the rotation of a ventilating fan into the fermenting tub through the inlet when the inlet of a top cover is opened by opening a lid for inputting the food waste into the fermenting tub. CONSTITUTION: The food waste processing device comprises by: fixing a top cover(3) having an inlet(2) in the upper part of a body(1); installing a lid(4) to be able to rotate to open and close the inlet(2) in the top cover; fixing a fermenting tub(5), the space to ferment the inputted food waste by mixing a fermenting assist agent, inside the body(1); ventilating the smell gas generated according to the fermentation of the food waste inside the fermenting tub to the outside of the body(1) by guiding according to a ventilating passage at rotating a ventilating fan(14); inhaling the outer air through an inhaling passage into the fermenting tub(5) when the smell gas inside the fermenting tub(5) is ventilated according to the rotation of the ventilating fan(14).
Patent KR-19980087619-A (KR)
Title: 온수와 전기겸용 조립식 천연석 구들장
Filed: 1998-09-03
Abstract: 바닥 전체가 아닌 일부분인 조립식 천연석 구들장의 난방을 온수와 전기를 겸용해서 사용할 수 있도록 하고, 천연석 구들장이 깨지거나 전기히터판이 고장이 났을 경우 교체가 용이하고 수리가 간편하도록 서로 분리 가능하도록 조립식으로 제작하고, 틀체와 천연석 구들장과의 사이에는 운모판을 끼워 넣어서 A/S를 하기 쉽도록 하고, 천연석 구들장의 온도를 『어깨 - 허리 - 다리』 부위별로 다르게 조절할 수 있게 구성된 전기히터판과 온도조절기와 리모콘을 고안하여 제작하고, 끝으로 전기히터판에서 방출되는 유해한 전자파가 인체에 전달되는 것을 차단시키도록 유해 전자파 흡수제를 부착하여 유해전자파를 차단할 수 있는 조립식 천연석 구들장이다.
Patent KR-20000019899-A (KR)
Title: Method for sensing breakdown of three-way valve in gas boiler
Inventor: PARK JAE KYEONG
IPC: F24H9/20
Filed: 1998-09-16
Abstract: PURPOSE: A method is provided to simply solve the inconvenience caused by the breakdown of a three-way valve by indicating the abnormality or breakdown of the three-way valve through the temperature of heating water. CONSTITUTION: Breakdown of a three-way valve is detected by: sensing the temperature of heating water when converting into hot water from heating or doing it reversely as a gas boiler is operated by selecting the heating/hot water mode; confirming if the temperature of the heating water reaches the set temperature range; and indicating the abnormality or breakdown of the three-way valve for changing the flow of heating and hot water. A microcomputer informs a user or a repairman of the abnormality of the three-way valve by controlling an indicating unit.
Patent KR-19990030204-A (KR)
Title: 디지털회로를 이용한 수평주사펄스신호제어회로
IPC: H03K4/06
Filed: 1998-09-28
Abstract: 본 발명의 수평주사펄스신호제어회로에서, 기준클럭발생회로(1)는 수평동기신호 HSYNC와 동기로 기준클럭신호 S 0 를 발생한다.    제1 및 제2 수평위치기준펄스발생회로(2, 3)는 각각 제1 및 제2 수평위치기준펄스신호 S 3 과 S 4 를 발생하고, 이 제1 및 제2 수평위치기준펄스신호 S 3 과 S 4 의 위상은 수평동기신호에 대해 다르고 상기 기준클럭신호의 제1 및 제2 펄스에 대응한다.    제1 및 제2 톱니파발생회로(4, 5)는 제1 및 제2 수평위치기준신호에 응답하여 각각 제1 및 제2 톱니파신호 S 5 와 S 6 를 발생한다.    제1 및 제2 비교기(6, 7)는 제1 및 제2 톱니파신호를 수평위치선택전압 V R 과 비교하여 제1 및 제2 비교신호 S 7 과 S 8 을 각각 발생한다.    RS형 플립플롭(8)은 제1 및 제2 비교신호에 의해 각각 세트되고 리세트된다.    RS형 플립플롭의 출력신호 S 9 은 수평주사펄스신호로서 사용된다.
Patent KR-20000026634-A (KR)
Title: Pattern forming method of ferroelectric material
Inventor: PARK JU ON
IPC: H01L21/306
Filed: 1998-10-22
Abstract: PURPOSE: A method gor forming a ferroelectric material pattern is provided to enhance the durability and the characteristic of the semiconductor element by patterning the ferroelectric material with the exposing mask. CONSTITUTION: A system comprises a semiconductor substrate(11), a lower electrode material(13), a ferroelectric material(15) and a sensitive layer(27). The ferroelectric material pattern is formed by developing and exposing after pre-baking and exposing the ferroelectric material. A method comprises a step of forming the ferroelectric material by adding photo-sensitive liquid using the spin-coating method; a step of forming ferroelectric material pattern by developing and exposing the ferroelectric material; a step of forming drying the ferroelectric material; and a step of heat treating the ferroelectric material. Therefore, the ferroelectric material is formed by exposing and developing step without using extra etching process.
Patent KR-20000026797-A (KR)
Title: Structure of integrated evaporator for refrigerator and preparing method thereof
Inventor: HWANG BONG SU
IPC: F25B39/02
Filed: 1998-10-23
Abstract: PURPOSE: A structure of an integrated evaporator is provided to make smooth the flow of the hot air flowing upward from the bottom of an evaporator by forming the inclined angular degrees of a louver fin more steeply without tearing of the contact part between the louver fin and a pipe. CONSTITUTION: A structure of an integrated evaporator is prepared by: forming a defrosting pipe(110) by extrusion molding; forming refrigerant pipes(120) on both sides of the defrosting pipe; and forming platy fin forming parts(130) between the defrosting pipe and the refrigerant pipes. The defrosting pipe and the refrigerant pipe are formed in hollow core state to deliver the refrigerant or the heat from a defrosting heater via the hollow core. And multiple louver fins(140) are formed by processing the fin forming part after the extrusion molding to form a perfect integrated evaporator. Herein, the inclined angular degrees of the louver fins are formed over 60 degrees to perform optimum efficiency by using a second jig. Thereby, the upward flow of air from the bottom of the evaporator becomes smooth. And the discharge of defrosting water from upper part to lower part becomes smooth. Therefore, the efficiency of the evaporator is maximized.
Patent KR-20000027612-A (KR)
Title: Electro static discharge protecting circuit
Inventor: KIM HYUN GON
IPC: H01L27/04
Filed: 1998-10-28
Abstract: PURPOSE: An ESD(electro static discharge) protecting circuit is provided to improve an output current of data input/output(DQ) pins and reduce pin capacitance by further comprising bipolar transistors and a resistor. CONSTITUTION: A circuit comprises a pull-up transistor(T1) connected between a power supplied voltage(Vcc) and a DQ pin, and a pull-down transistor(T2) connected between a ground(Vss) and the DQ pin. The circuit further comprises a first bipolar transistor(T3) formed between the Vcc and the DQ pin and connected in parallel with the pull-down transistor(T2), a second bipolar transistor(T4) formed between the Vss and the DQ pin and connected in parallel with the pull-up transistor(T1), and a resistor(R1) connected between the DQ pin and the pull-up and pull-down transistors(T1,T2).
Patent KR-20000031399-A (KR)
Title: Method for detecting tracking error and apparatus thereby
Inventor: KIM KOON JIN
IPC: G11B7/08
Filed: 1998-11-06
Abstract: PURPOSE: A method for detecting the tracking error and the apparatus thereby are provided to abstract the tracking error in the state there is no disk wobble. CONSTITUTION: A tracking error detection apparatus is composed of a subtraction/addition device, a band pass filter, a subtraction device and a low pass filter. The subtraction/addition device receives the input of the reference signal(A,B,C,D) to adjust the location of pickup and generates the reference signal of x axis and y axis. The band pass filter receives the reference signal of x axis and y axis outputted from the subtraction/addition device and detects only a specific frequency band. The subtraction device subtracts the output signal of the subtraction/addition device from the output of the band pass filter and outputs the subtracted value. The low pass filter eliminates noise from the output signal of the subtraction device and outputs it.
Patent KR-20000031870-A (KR)
Title: Method for controlling isochronous data
Inventor: CHO SEUNG HUN
IPC: H04L12/40
Filed: 1998-11-11
Abstract: PURPOSE: A method for controlling isochronous data is provided to transmit isochronous data by correcting a plug necessary for data transmission. CONSTITUTION: A method for controlling isochronous data comprises the steps of a tabling process, an addition process, and a data transmission process. The tabling process is to examine a predetermined register, search output plug control registers of nodes, and table predetermined information. The addition process is to search input plug control register and adds the predetermined information to the output plug control register table. The data transmission process is to change a transmission band width and a channel number, and transmit an isochronous data through the changed channel.
Patent KR-19990062566-A (KR)
Title: 음성 인식 신뢰도 레벨 디스플레이
IPC: G10L15/22
Filed: 1998-11-12
Abstract: 본 발명의 음성 인식 컴퓨터 시스템 및 방법은 하나 또는 그 이상의 디스플레이되는 워드를 인식하는데 있어 음성 인식기가 가진 신뢰도 레벨을 표시한다. 이 시스템 및 벙법은 음성 인식 에러의 빠른 식별을 허용한다. 개개의 인식된 워드의 다수의 신뢰도 레벨이 시각적으로 표시될 수도 있다. 또한, 이 시스템 및 방법은 그 시스템의 사용자로 하여금, 시각적 표시가 이루어질 때를 판단하기 위해 임계치 레벨을 선택할 수 있도록 허용한다.
Patent KR-20000032479-A (KR)
Title: Apparatus for driving control valve of variable capacity compressor
Inventor: AHN IN SU
IPC: B60H1/32
Filed: 1998-11-14
Abstract: PURPOSE: An apparatus for driving a control valve of a variable capacity compressor is provided to improve the performance of engine and prevent the damage of compressor by varying the piston stroke of the compressor by controlling the position of the control valve according to the traveling state of the vehicle. CONSTITUTION: An apparatus for driving a control valve of a variable capacity compressor includes a traveling state detection part(70) for outputting a vehicle speed detection signal and a speed change detection signal, a controller(80) for outputting a motor driving signal only when the vehicle is quickly accelerated or traveling an upward slop in response to the vehicle speed detection signal and the speed change detection signal, a step motor(90) mounted at a lower part of a bellows of the control valve(60) for pushing upward the lower part of the bellows by a predetermined height in response to the motor driving signal.
Patent KR-20000032920-A (KR)
Title: Apparatus and method of preventing refill of toner in electrophotography system
Inventor: NO SEOK PIL
IPC: G03G15/10
Filed: 1998-11-18
Abstract: PURPOSE: An apparatus and method of preventing refill of a toner in an electro photography system are provided to prevent the reuse of a toner cartridge, by monitoring the state of the toner. CONSTITUTION: An apparatus of preventing refill of a toner in an electro photography system comprises a sensing section(100) for sensing a remaining amount of toner received in a developing device(6) and alerting the empty state of the toner if the toner is lowered below a predetermined level, a developing voltage applying section(200) for raising a first developing voltage applied to the developing device to a first developing voltage, depending upon receiving a signal indicating the empty state of toner, and a refill preventing section(300) for electrically opening between a terminal(301) and a ground point(302) of the developing device when the first developing voltage is applied to the terminal, and for maintaining the state of circuit short between the terminal and the ground point when the second developing voltage is applied to the terminal.
Patent KR-20000033232-A (KR)
Title: Manufacturing methods of 4-hydroxycoumarin and derivatives thereof
Inventor: PARK WOI SUK
IPC: C07D335/04
Filed: 1998-11-20
Abstract: PURPOSE: Two Manufacturing methods of 4-hydroxycoumarin and nitrogen or sulfur derivatives thereof using raw materials which are cheap and easy to obtain are provided which produce 4-hydroxycoumarin and nitrogen or sulfur derivatives thereof in high yields. CONSTITUTION: A first manufacturing method of compound(1) described in drawing 1, wherein X represents O, S or N and R represents methyl or ethyl, comprises the following steps of: a) reacting compound(2) with acetic anhydride in the presence of pyridine to produce compound(3); b) halogenation of compound(3) by using SOCl2, PBr3 or PBr5 and then condensation reaction with CH2(CO2R)2/Mg, EtOH without isolation and purification to produce compound(5); c) reflux and agitation of compound(5) with strong acid such as sulfuric acid, then filtering and drying of the precipitation to obtain compound(1), target compound. A second manufacturing method of compound(1) described in drawing 2, wherein X represents O, S or N, and R and R¬1 represent the same or different methyl or ethyl, comprises the following steps in one-pot: a) halogenation of compound(3) by using SOCl2, PBr3 or PBr5 in the presence of urea; b)condensation reaction with RCOCH2CO2R¬1 and 40 % NaOH to produce compound(6); c) cyclization ration of compound(6) by the treatment of acid or alkali in the presence of alcohol d) reflux agitation of compound(7) with strong acid to obtain compound(1), target compound.
Patent KR-20000033249-A (KR)
Title: Solvent remover and using method thereof
Inventor: LIM HEUNGBIN
IPC: B01D53/22
Filed: 1998-11-20
Abstract: PURPOSE: A solvent remover is provided to solve a problem of introducing an organic sample to ICP(inductively coupled plasma). CONSTITUTION: A DMD(Double Membrane Desolvator)(20) includes a central pipe making up an inner film(21a) inside a body(24) and a second pipe making up an outer film(21b). Inner flow gas(22a) flows inside the central pipe while outer flow gas(22b) flows outside the second pipe. A sample aerosol wet droplet(23a) sprayed from a sprayer is vertically introduced between the inner and outer films, which flows in the opposite direction of a flow direction of the inner and outer flow gas through a space between the inner and outer films. Herein, while passing through a double film, the solvent of the aerosol wet droplet is removed, and a dry aerosol is discharged. Then the discharged sample is introduced to a sample analysis system.
Patent KR-20000039980-A (KR)
Title: Method for transmitting multi-message between service control part and subscriber registration part of communication system
Inventor: SONG JEONG JIN
IPC: H04L12/58
Filed: 1998-12-16
Abstract: PURPOSE: A method for transmitting a multi-message between a service control part and a subscriber registration part of a communication system is provided to transmit data of a service control part and a subscriber registration part independently of a buffer size. CONSTITUTION: A method for transmitting a multi-message between a service control part and a subscriber registration part of a communication system comprises the following steps. A size of data from a database of a service control part is set up as a data size less than or equal to a buffer size. Next data are examined. A point is set up if the next data exist. The service control part transmits the data to a server of a subscriber registration part. The subscriber registration part examines the next data from a structure of the transmitted data and sets up the next data and the point and transmits them to the service control part if the next data exist.
Patent KR-20000040537-A (KR)
Title: Battery check device
Inventor: LEE YONG SEOK
IPC: G01R31/36
Filed: 1998-12-18
Abstract: PURPOSE: A battery check device is provided to minimize battery consumption and electric impulse generated in checking residual capacity of the battery. CONSTITUTION: A battery check device comprises a terminal voltage detection unit(21), a sampling/holding unit(22) and an output unit. The detection unit(21) detects the terminal voltage of the battery by variably structuring respective corresponding circuit in order to measure the voltage in loading or unloading. The sampling/holding unit(22) measures the analog values of the voltage detected by the detection unit. The output unit receives the output signals of the sampling/holding unit(22) to convert them into readable format.
Patent KR-20000044381-A (KR)
Title: Method for self reporting in network management system
Inventor: LEE YEONG HO
IPC: H04L12/24
Filed: 1998-12-30
Abstract: PURPOSE: A method for self-reporting in a network management system, is provided to delete a work of generating/interrupting a association, when many notifications are generated in a short time, and to prevent a case disusing notifications, not processed. CONSTITUTION: In a method for self-reporting in a network management system, an agent reports a manager autonomously in a communication system utilized the network management system using the manager and the agent, which are composed by use of a common management information protocol(CMIP). The method contains processes. The first process is, when a notification to be transmitted, is generated, but a association with the manager is not bound, to bind the association, and to transmit a notification to the manager. The second process is, when another notification is continued to be generated in a regular time, after transmitting the notification, to maintain the association, and to transmit the another notification to the manager. The third process is to intercept the association, when not generating the another notification.
Patent KR-20000047139-A (KR)
Title: Optical fiber ribbon
Inventor: YANG TAE SOO
IPC: C03B37/00
Filed: 1998-12-31
Abstract: PURPOSE: An optical fiber ribbon is provided which has a buffering part made of a flexible material in the round surface of outline optical fiber in case that a concentrated side pressure acts to the part of the corner of the optical fiber ribbon inserted in the groove, and absorbs the side pressure by bending the both ends of the optical fiber ribbon at a constant angle centering around a buffering groove, so it prevents a microbending and a leakage of optical signal. CONSTITUTION: In an optical fiber ribbon coated with many optical fibers with ribbon shape, a buffering groove has fixed depth in the up and down surface of a ribbon coating(22) between the outline optical fiber(21a) of the optical fiber ribbon(20) and the adjacent optical fiber(21) or one side of the lower surface and another side of the upper surface, is formed in the longitudinal way, and a buffering part(28) coated with the flexible material in the shape of ribbon, is formed at the round surface of the outline of the optical fiber(21a).
Patent KR-19990044259-A (KR)
Title: 회로 보드 제조시 어셈블리-라인 박리 및 새깅 방지를 위한 회로 보드 패널과 그 제조 방법
IPC: H05K3/00
Filed: 1997-06-09
Abstract: 보드 패널로부터 단일화(singulation) 동안의 보드 박리(delamination) 및 전-후 조립 동안의 보드 새깅(sagging)은 셀룰러(cellular) 제조 라인들에서 직면하는 가장 큰 두가지 문제점들이 있다.  본 발명의 회로 보드 패널(600)과 그 방법은 회로 보드 제조시 어셈블리-라인 박리 및 새깅을 실질적으로 제거한다.  다수의 슬롯들(slots)은 회로 보드 프로필에 적합하도록 펀칭된다.  V-홈들(606, 608)은 상기 슬롯들을 통하여 각각의 회로 보드 프로필들을 따라서 그리고 회로 보드의 상부와 하부 상의 정확히 반대 측에 절개된다.  상기 컷-아웃들(604) 및 v-홈(606, 608) 배치를 최적화시킴으로써, 찢김(tearing)과 박리는 제거되며 새깅은 실질적으로 감소한다.
Patent KR-20000064496-A (KR)
Title: 실리콘성분을함유하는무왁스가구광택제
IPC: C09G1/04
Filed: 1996-12-13
Abstract: 가구 광택제를 함유하는 무왁스 실리콘은 저점도 실리콘 유체와 실리콘 검(1) 또는 저점도 실리콘 유체와 폴리디오가노실록산(2) 또는 저점도 실리콘 유체, 실리콘 검, 폴리디오가노실록산(3)과 함께 물과 하나 이상의 계면활성제를 사용하여 제조한다.
Patent KR-19990076672-A (KR)
Title: 3차 알킬 에테르를 제조하는 방법
IPC: C07C41/06
Filed: 1996-12-19
Abstract: 본 발명은 올레핀계 탄화수소 피드스톡의 C 4-7 이소올레핀을 하나 이상의 반응 영역에서 제 1 촉매의 존재하에 알칸올과 반응시켜서 3차 알킬 에테르 및 3차 알킬 에테르의 혼합물을 함유하는 반응 혼합물을 형성시키는 단계, 반응 혼합물을 증류 칼럼에 공급하는 단계, 반응 혼합물을 증류시키는 단계 및 증류의 바닥 생성물과 함께 알킬 에테르(들)를 회수하는 단계를 포함하는 3차 알킬 에테르를 제조하는 방법에 관한 것이다.  비반응 C 4 탄화수소 및 알칸올에 의해 형성된 공비혼합물이 증류의 상부 생성물로서 배출된다.  본 발명에 따라, 칼럼의 액체 흐름의 일부가 배출되어 부배출물을 형성시키고, 부배출물은 반응 영역으로 재순환된다.  결과적으로, 반응성 C 6 탄화수소의 전환율이 증가되고, 에테르 공정의 작업 비용이 절감된다.
Patent KR-19990076838-A (KR)
Title: 충전제 충전 장치, 충전제의 충전 방법 및충전제 충전 칼럼집합체
IPC: B01J8/02
Filed: 1996-12-19
Abstract: 본 발명은, 충전제 수용 공간을 집합한 집합체와, 상기 집합체에 있어서의 충전제 수용 공간의 하단 개구부에 끼워 넣을 수 있는 하부 가동 마개를 갖는 하부 가동 마개 부재와, 충전제 수용 공간의 상단 개구부에 끼워 넣을 상부 가동 마개를 가지며, 단시간에 다수의 칼럼 속에 충전제를 충전할 수 있는 충전제 충전 장치와; 
     상기 충전제 충전 장치를 사용함으로써, 단시간 내에 게다가 각 충전제 수용 공간 내에 균일하게 충전제를 충전할 수 있는 충전 방법; 및 
     상기 충전제 충전 장치 및 충전 방법을 이용함으로써, 소형이며 균일하게 충전된 충전제를 갖는 칼럼 집합체인 충전 칼럼 집합체; 를 제공한다.
Patent KR-20000022252-A (KR)
Title: Anticonvulsant derivatives useful in treating psoriasis
Inventor: SHANK RICHARD P
IPC: A61K31/18
Filed: 1997-06-24
Abstract: PURPOSE: Anticonvulsant derivatives useful in treating psoriasis are provided. CONSTITUTION: A method for treating psoriasis comprising administering to a human afflicted with such condition a therapeutically effective amount for treating such condition of topiramatea, compound of the formula I, wherein, X is CH2 or oxygen; R1 is hydrogen or alkyl; and R2, R3, R4 and Rs are independently hydrogen or lower alkyl and, when X is CH2, R4 and Rs may be alkene groups joined to form a benzene ring and, when X is oxygen, R2 and R3 and/or R4 and Rs together may be a methylenedioxy group. The therapeutically effective amount is of from about 50 to 400 mg optionally 25 to 200 mg.
Patent KR-20000055159-A (KR)
Inventor: HAN CHAN HUI
IPC: H01L21/306
Filed: 1999-02-03
Abstract: PURPOSE: A method for flattening a semiconductor device is to simplify a flattening process by performing an In-situ O2 plasma treatment after depositing a flattening layer, and to improve a flattening level so as to prevent a swelling effect. CONSTITUTION: A flattening method of semiconductor device comprises the steps of: forming a first polysilicon layer as a gate electrode of a transistor and a second polysilicon layer as a bit line, on a semiconductor substrate, and forming an interlayer insulation layer for isolating from a polysilicon layer for capacitor; forming a fourth polysilicon layer for capacitor on the interlayer insulation layer, and depositing a flattening layer; and depositing an undoped silicon oxidation layer as a capping layer, and In-situ O2 plasma treating the flattening layer.
Patent KR-20000055522-A (KR)
Inventor: KIM GYEONG SU
IPC: C07D477/20
Filed: 1999-02-08
Abstract: PURPOSE: Provided is a synthetic method of imipenem which can easily remove a protecting group by using allyl group as the protecting group of 2-carboxy group. CONSTITUTION: A synthetic method comprises the steps of: condensing bicyclic ketoester of formula(II) and a phosphochloridate derivative in the presence of base to prepare a phosphate derivative of formula(III); coupling 2-aminoethantiol hydrochlorate with the produced phosphate derivative of formula(III) in the container to prepare a thienamycin derivative of formula(IV); reacting the produced thienamycin derivative of formula(IV) with benzylimidate in the container to prepare an imipenem derifative of formula(V) with carboxy group as a protecting group; and demasking the imipenem derivative produced using a moupholine dervative and tetrakis triphenylphosphin paladium.
Patent KR-20000055856-A (KR)
Inventor: HWANG JUN SEOP
IPC: G01D5/26
Filed: 1999-02-10
Abstract: PURPOSE: A method of detecting rotor position of permanent magnet type synchronous motor for automotive vehicle is provided to reduce manufacturing cost for the motor while detecting position of the motor rotor by utilizing a hall sensor. CONSTITUTION: A method of detecting rotor position of permanent magnet type synchronous motor having first, second and third position sensors for generating three different absolute angle signals having a phase difference of a first set angle according to rotation of the motor, the method comprises the steps of driving a synchronous motor; measuring an amount of change of time corresponding to the amount of change of movement of a second set angle applied from position sensors; calculating rotation speed of the synchronous motor by dividing the amount of change of movement of the second set angle by the amount of change of time; calculating an amount of change of movement within the second set angle by multiplying the calculated rotation speed of the synchronous motor and a predetermined time period; and detecting the position of the rotor corresponding to the calculated amount of change of movement.